Sweeper sat down. 'Good. And now, Mister Vimes, I'll take you back inside and I'll give you some background on the sergeant and we'll work out what you need to know from all this, and we can set up a little loop so that you can tell yourself what you need to know. No addresses, though!'
'And what'll happen to me?' said Vimes. 'The me sitting here now? The... er... other me walks away and me, this me, you understand... Well, what happens?'
Sweeper gave him a long, thoughtful look. 'Y'know,' he said, 'it's very hard to talk quantum using a language originally designed to tell other monkeys where the ripe fruit is. Afterwards? Well, there will be a you. As much you as you are now, so who can say it's not you? This meeting will be... a sort of loop in time. In one sense, it will never end. In a way, it'll be-'
'Like a dream,’ said Vimes wearily.
Sweeper brightened. 'Very good! Yes! Not true, but a very, very good lie!'
'You know, you could've just told me everything,' said Vimes.
'No. I wouldn't be able to tell you everything and you, Mister Vimes, aren't in the mood for games like that. This way, a man you trust - that's you - will tell you all the truth you need to know. Then we'll do a little of what the younger acolytes call "slicing and glueing", and Mister Vimes will go back to Treacle Mine Lane a little wiser.'
'How are you going to get hi- me back to the Watch House? Don't even think about giving me some kind of potion.'
'No. We'll blindfold you, twirl you round, take you the long way, and walk you back. I promise.'